CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina isahayensis Asano 1962
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Citation: Globigerina isahayensis Asano 1962taxonomic rank: SpeciesDescribed on page(s) : 55-56Type specimens: Pl. 21, figs. 9a, b, c,; Holotype:- IGPS coll. cat. no. 77225.Type sample (& lithostrat): From Enoura formation, correlative with the upper part of the Kyoragi formation;Type age (chronostrat): EoceneType locality: 80 m depth of the boring core at Kamihara, Enoura-mura, Kita-Takaki- gun, Nagasaki Prefecture; Kyushu, JapanType repository: IGPS Japan
Original Description "Test trochospiral, low-spired, perophery rounded: four chambers in last whorl, of which last one is very small and attached on peripheral side; sutures depressed, slightly curved; wall calcareous, finely perforate; aperture at umbilical end of last formed chamber, with a small lip; umbilicus not covered by any bulla. Size: Maximum diameter of holotype 0.4 mm. Extra details from original publication Remarks:- This new species is apparently similar to Catapsydrax unicavus Bolli, Loeblich and Tappan, but is distinguished from it by the much smaller last chamber, instead of a bulla. In this respect, it is somewhat related to Catapsydrax unicavus Blow (not Bolli, Loeblich and Tappan), but differs in the number of chambers of the last whorl.
Occurrence:- From the upper part of the Kyoragi formation to the top of the Sakasegawa group.
References:
Asano, K. (1962). Tertiary Globigerinids from Kyushu, Japan. Science Reports of the Tohoku University. Special Volume 5: 49-65. gs
Globigerina isahayensis compiled by the pforams@mikrotax project teamviewed: 10-12-2024
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